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Anharmonic Thermal Atomic Vibrations in the Cubic Phase of Cs 2 NaNdCl 6 Single Crystals
Author(s) -
Makarova I. P.,
Misyul S. V.,
Muradyan L. A.,
Bovina A. F.,
Simonov V. I.,
Aleksandrov K. S.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221210205
Subject(s) - anharmonicity , octahedron , anisotropy , crystallography , thermal , vibration , single crystal , phase (matter) , diffraction , materials science , condensed matter physics , cubic crystal system , phase transition , crystal (programming language) , crystal structure , chemistry , physics , thermodynamics , optics , quantum mechanics , programming language , organic chemistry , computer science
Thermal atomic vibrations in the cubic phase of Cs 2 NaNdCl 6 single crystal undergoing the structural phase transition (PT) at 138 K are investigated from the data of X‐ray diffraction obtained at 278, 218, and 148 K. A significant anisotropy of thermal vibrations and their deviations from harmonic behaviour are found for the Cl‐atoms of the structure. These atoms displace from their equilibrium positions below PT due to the tilts of the octahedral groups.